The asteroid you mean is "2008 OC6". It was big and fast and, for a while, it was on NASA's risk page. They put stuff here while they investigate celestial mechanics and get a better feel for the actual risk. There were a few conspiracy theories about why it suddenly disappeared from the risk page (i.e. have they found a world-ender and don't want to worry the public?)
But the truth is that it got bumped to the "not a risk" page. If you want peace of mind, you can check it at:
Is it normal to fear that the world will end on 26 september 2011 ?
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The asteroid you mean is "2008 OC6". It was big and fast and, for a while, it was on NASA's risk page. They put stuff here while they investigate celestial mechanics and get a better feel for the actual risk. There were a few conspiracy theories about why it suddenly disappeared from the risk page (i.e. have they found a world-ender and don't want to worry the public?)
But the truth is that it got bumped to the "not a risk" page. If you want peace of mind, you can check it at:
http://neo.jpl.nasa.gov/risk/removed.html
It's about halfway down the page.